refactor: improve code quality and efficiency in various files (#548)

- Replace loadConfig() with _ = loadConfig()
- Update file permissions from 0660 to 0o660
- Simplify variable declarations
- Replace golang.org/x/crypto/ssh/terminal with golang.org/x/term
- Remove unused getCertPrincipals function
- Replace time.Now().Sub() with time.Since()
- Add test for ArgToIndex function

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-on: https://gitea.com/gitea/tea/pulls/548
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.io>
Co-authored-by: appleboy <appleboy.tw@gmail.com>
Co-committed-by: appleboy <appleboy.tw@gmail.com>

modules/print/comment.go

@@ -18,12 +18,12 @@ func Comments(comments []*gitea.Comment) {
 		baseURL = getRepoURL(comments[0].HTMLURL)
 	}
 
-	var out = make([]string, len(comments))
+	out := make([]string, len(comments))
 	for i, c := range comments {
 		out[i] = formatComment(c)
 	}
 
-	outputMarkdown(fmt.Sprintf(
+	_ = outputMarkdown(fmt.Sprintf(
 		// this will become a heading by means of the first --- from a comment
 		"Comments\n%s",
 		strings.Join(out, "\n"),
@@ -32,7 +32,7 @@ func Comments(comments []*gitea.Comment) {
 
 // Comment renders a comment to stdout
 func Comment(c *gitea.Comment) {
-	outputMarkdown(formatComment(c), getRepoURL(c.HTMLURL))
+	_ = outputMarkdown(formatComment(c), getRepoURL(c.HTMLURL))
 }
 
 func formatComment(c *gitea.Comment) string {